18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2017 ARM Ltd. 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#include <linux/uaccess.h> 78c2ecf20Sopenharmony_ci#include <asm/barrier.h> 88c2ecf20Sopenharmony_ci#include <asm/cacheflush.h> 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_civoid memcpy_flushcache(void *dst, const void *src, size_t cnt) 118c2ecf20Sopenharmony_ci{ 128c2ecf20Sopenharmony_ci /* 138c2ecf20Sopenharmony_ci * We assume this should not be called with @dst pointing to 148c2ecf20Sopenharmony_ci * non-cacheable memory, such that we don't need an explicit 158c2ecf20Sopenharmony_ci * barrier to order the cache maintenance against the memcpy. 168c2ecf20Sopenharmony_ci */ 178c2ecf20Sopenharmony_ci memcpy(dst, src, cnt); 188c2ecf20Sopenharmony_ci __clean_dcache_area_pop(dst, cnt); 198c2ecf20Sopenharmony_ci} 208c2ecf20Sopenharmony_ciEXPORT_SYMBOL_GPL(memcpy_flushcache); 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_civoid memcpy_page_flushcache(char *to, struct page *page, size_t offset, 238c2ecf20Sopenharmony_ci size_t len) 248c2ecf20Sopenharmony_ci{ 258c2ecf20Sopenharmony_ci memcpy_flushcache(to, page_address(page) + offset, len); 268c2ecf20Sopenharmony_ci} 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_ciunsigned long __copy_user_flushcache(void *to, const void __user *from, 298c2ecf20Sopenharmony_ci unsigned long n) 308c2ecf20Sopenharmony_ci{ 318c2ecf20Sopenharmony_ci unsigned long rc; 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_ci uaccess_enable_not_uao(); 348c2ecf20Sopenharmony_ci rc = __arch_copy_from_user(to, from, n); 358c2ecf20Sopenharmony_ci uaccess_disable_not_uao(); 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ci /* See above */ 388c2ecf20Sopenharmony_ci __clean_dcache_area_pop(to, n - rc); 398c2ecf20Sopenharmony_ci return rc; 408c2ecf20Sopenharmony_ci} 41